Sawing machine



Feb. 28, 1928. 1,660,710

A. c. JAcoBsoN SAWING MACHINE Filed Jan. i8, 1926 zal' m" `Xena c. JaooBsoiv, or SAN rRAitorsoo, oaLIroRNiA.

sAvv'ING MACHINE.

Appneenmniea January 18,1926. i serial No. 81,939.

This invention ,relates to sawing machines and particularly to an improved power operated portable saw. My improved 'saw comprising this invention is mounted for 5 vfree traveling and swinging movement tothe parts to be sawed, is power driven by an electric motor, which motor is so mounted as to counterbalance the saw, and is provided with automatic switch means for operating' the motor and saw only whenthe saw is brought to theworking position. It is the Vprimary object of my invention to provide an improved sawing machine of thisl type which' is particularly adapted for use as a butchers' lpsaw. i My improved machine is also constructed in a manner adapting the saw and itsfsupporting parts to be adjusted vertically to the'V most convenient operative position', and the traveling carriage which supports such parts is also provided with means for securing the same against movement on its supporting track when desired. It is another object of my invention to provide an improved sawing machine of this type and having these improved and novel features which render the same more efficient and convenient in operation.

In the accompanying drawing I have shown certain specific'embodiments of my invention, but lit will be understood that the invention can be otherwise embodied and that the drawings are not to be construed asr defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose. l Referring to the figures of the drawing:

Figure 1 is a perspective view of my im* proved sawing machine in operation.

Figure 2 is an enlarged perspective view of the machine.

i Figure 3 is a side elevation thereof par tially in section. Figure4 is a side elevation of the carriage and yoke. .l

Figure 5 is a fragmentary plan .sectional view of the machine, taken on line V-V of Fig. 3. In the drawing, 1 indicates an ,overhead track adjustably mounted on a pair of supporting posts 2 secured to the ceiling. My improved sawing machine -is hung fromk a carriage 3 traveling on this track. The carriage comprises a body portion supported by rollers 4 and having a downwardly eX- tending sleeve 5. A forked yoke 6 has an upwardly extending shank 7 adjustbly 'I mounted in the sleevel 5 and adapted to be held therein bya set screw 8, Y.

The operating parts pf my machine are 6U mounted onan arm 9 pivotally'supportedin the yoke on trunnions 10.` Thisentire arm is hollow and provides a housing for the op-V 'i erating' parts.l An electricV motor '.11 is mounted lin the enlarged end 12 of the arm at 65 one side of the trunnions and a circle saw 13 is -mounted, on atr'ansverse shaft 14 in` the other end of the arm. VA shaft 15 and bevel gears 1'6 operatively connect the motor tol shaft 14.' A fixed guard17 and a mov 70 able guard 18 surround thek saw as described 1n my co-pending application Serial No. $1,940, filed 'January 18,1926. An operating handle 19 is secured to the-saw end of the arm. "j y r "15 The motor 12 is controlled by' a switch within a b ox 20. This switch isnormally closed so as to operate the motor. The relative weight of the motor is such that the arm Y y normally assumes the posit-ion illustrated in Figure 2. In such position, the switch button4 21 engages against a resilient stop 22 on the yoke 6, whereby the 'button is forced inwardly and opens the switch. Thus, whenl the-saw is not inuse, it tilts upwardly in a manner moving the saw well above the work table and automatically opens the motor cir- I cuit. A socket is provided in the box 20 for receiving the electrical connection 23. l

Normally, the carriage 3 is free to move 90 along thestrack 1. yIt may vbe desired atv times to prevent such movement and to secure the carriage in a definite position on the track. A plate 24 extends over the top of" the trackbetween the rollers 4 and is secured 95 to the upper end of a rod 25. This rod eX- tends ldownwardly through a lug 26 on the yoke. A thumb nut 27 is threaded to the rod beneath the lug. By adjusting thisnut, plate 24 can be drawn into tight frictional engage- 10o .ment with the track and therebyuhold, the

carriage against movement.

The operation of the machine is lbelieved' `to be obvious. Normally, the machine is in T v the position shown in Fig. 2, wherein `the x saw is well above the table. thus leaving the table free yfor arrangingthe meat thereon. vl/Vhenv a bone is to be sawed, the operator grasps the handle 19 and pulls the saw forg wardly and downwardly, the free movementv 11o of the carriageon the track permitting the saw to be properly placed laterally.. `As the Arnia@ l `2- v v t 1,660,710

saw is dravvn downwardly, the switch button 21 leaves the stop 22, whereupon the switch automatically closes and starts the motor.

'vio

"When the saw reaches the Work, it has attained sufficient momentum to efiiciently perform the sawing operation. The operator moves the guard 18 upwardly when dra-Wing the Saw downwardly, bydraw'ing the finger latch 28 outwardly Yas defined in my said co-pendingapplication. When the sawing operation is completed, the saw isreleased `and automatically tilts upwardly and bebination of a downwardly extending yoke having angularly disposedlower ends with Y anupvvardly open recess in each, means Supporting the yoke` for `free movement for- Waldly and backwardly, an arm ypivotally,

supported -in the yoke by trunnions seated in the recesses`,a motor on the arm at the rear iside of the yoke, a rotary saw on the arm l f at the front ysidel of the yoke, an operative driving connection from the motor to the saw, the arm being so balanced. that the motor normally raises the saw vto the inoper ative position, and a. handle on the saw end of the arm for pulling the arm'and saw into the operative position, the Varm being removable from the yoke by raising the trunnions from the recesses. K

2. A sawing machine, comprising` the combination of a yoke, means/supporting the yoke for lateral movement, an arm extending between the tivo legs of the yoke and pivotally supported thereby on trunnions at opposite sides of the arm, a motor on` the arm at the rear side of the yoke, a rotary Saw on the arm at the front side of the yoke,`

anV operative driving connection from the motor to the saw, a lnormally closed switch in the motor circuit mounted directly onthe motor, an extension on the lower Vendv of the'u yoke, the arm being so ybalanced that the motor normally raises the saw to the inoperative position and the extension beingso located that it isV then engaged kby and opens the switch, and a handle on the saw end of the arm for pullingthe Yarm and Saw 'intoV the operative position.

Azioni.' o. JAooBsoN. t i 

